对冷龙岭隧洞碎(煤)屑流地质灾害的处理

Discussion on the Treatment of Geological disaster of Fragmentary Flows(Slack) for Lenglongling Tunnel

研究目的:根据引硫济金工程冷龙岭隧洞的施工实践,通过分析施工中遇到的地质灾害,为隧洞"碎(煤)屑流地质灾害"的施工处理提供技术支持。研究结论:(1)"深孔预注浆加固+大管棚超前支护"的综合施工技术处理碎(煤)屑流地质灾害是可行的。该方法能有效地挤密和胶结岩体,提高围岩力学性能。同时,管棚与岩体结石形成具有一定刚度和强度的承载拱,为开挖提供安全的作业环境。(2)重视隧洞灾害地段的地质素描工作。(3)重视施工技术细节的处理:杜绝超设计长度开挖;底部止浆墙设计为台阶齿墙式;喷混凝土封闭注浆墙缝隙。(4)重视灾害地层排水。采取"堵、排"相结合的方式,通过注浆帷幕使水流集中,并设置深孔集水管导出水流。

Research purposes： Based on the construction practice in Lenglongling Tunnel, the analysis of how to deal with the geological disaster of fragmentary flows （ slack ） in tunneling are made for the purpose of providing technical support for construction. Research conclusions： （ 1 ） The deep hole grouting along with large pipe roof construction method is feasible for dealing with geological disaster of fragmentary flows （slack） , which can compact and cement the rock to enhance the mechanic property and at the same time, the large pipe roof can form a bearing anchor along with rock. （2） The more attention should be paid to the sketch for the geological disaster area. （3） The more attention should be paid to the details of the construction techniques： The excavation length is not allowed to exceed the design length, the grouting -stopping wall on bottom should be designed of stepped gear type and the wall seam should be closured with concrete. （4） The more attention should be paid to drainage in disaster area. For draining the water, the methods of drainage and blocking can be used.